Fix: Allow the LNURL spec fallback scheme for LNURLw (#3961)

lnbits/static/js/components/lnbits-qrcode-lnurl.js

@@ -8,6 +8,10 @@ window.app.component('lnbits-qrcode-lnurl', {
     prefix: {
       type: String,
       default: 'lnurlp'
+    },
+    href: {
+      type: String,
+      default: ''
     }
   },
   data() {
@@ -21,7 +25,10 @@ window.app.component('lnbits-qrcode-lnurl', {
       if (this.tab == 'bech32') {
         const bytes = new TextEncoder().encode(this.url)
         const bech32 = NostrTools.nip19.encodeBytes('lnurl', bytes)
-        this.lnurl = `lightning:${bech32.toUpperCase()}`
+        this.lnurl =
+          this.href && this.href.trim() !== ''
+            ? `${this.href}?lightning=${bech32.toUpperCase()}`
+            : `lightning:${bech32.toUpperCase()}`
       } else if (this.tab == 'lud17') {
         if (this.url.startsWith('http://')) {
           this.lnurl = this.url.replace('http://', this.prefix + '://')